package com.qk.filter;

import com.qk.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1.获取请求路径
        String url = request.getRequestURI();

        // 2.判断请求路径是否为登录请求, 如果是则放行
        if (url.contains("/login")) {
            log.info("登录请求:{},放行", url);
            filterChain.doFilter(request, response);
            return;
        }
        // 3.获取请求头token
        String jwt = request.getHeader("token");

        // 4.判断token是否存在, 如果为不存在,响应401状态码
        if (jwt == null || jwt.isEmpty()) {
            log.info("请求头token不存在");
            response.setStatus(401);
            return;
        }
        // 5.解析令牌,如果解析令牌报错,响应401状态码
        try {
            JwtUtils.parseToken(jwt);
        } catch (Exception e) {
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }
        // 6.如果解析成功, 放行
        filterChain.doFilter(request, response);
    }
}
